Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
115 words
Apparatus for obtaining a measure of data detection error in devices for detecting data signals, said apparatus comprising: first means (9) for producing unambiguously defined timing signals in response to data signals; second means (11, 15) coupled to the first means for producing test signals including pulses having constant width in response to the timing and data signals; third means (15. 17), coupled to the first means, for producing control signals for controlling the width of a test window with respect to the timing signals; and fourth means (18), coupled to the second and third means. for producing a test window by selectively accepting or rejecting test signal pulses in response to the control signals.
Claim 2
Dependent Claim
115 words
Apparatus for obtaining a measure of data detection error in devices for detecting data signals, said apparatus comprising: first means (9) for producing unambiguously defined timing signals in response to data signals; second means (11, 15) coupled to the first means for producing test signals including pulses having constant width in response to the timing and data signals; third means (15. 17), coupled to the first means, for producing control signals for controlling the width of a test window with respect to the timing signals; and fourth means (18), coupled to the second and third means. for producing a test window by selectively accepting or rejecting test signal pulses in response to the control signals.
Claim 3
Dependent Claim
22 words
Apparatus as claimed in claim 1, wherein said fourth means selectively rejects test signal pulses at each end of the test window.
Claim 4
Dependent Claim
25 words
Apparatus as claimed in claim 2. wherein said fourth means rejects the same number of test signal pulses at each end of the test window.
Claim 5
Dependent Claim
32 words
Apparatus as claimed in any preceding claim, wherein the number of accepted test signal pulses is proportional to the data detection error as a function of the width of the test window.
Claim 6
Dependent Claim
49 words
Apparatus as claimed in any preceding claim, wherein: the first and second means are a phase discriminator and voltage controlled oscillator (VCO), respectively, coupled in a phase lock loop; and the third means includes circuit means for producing signals representing opposite and concurrent phases of the VCO output signals.
Claim 7
Dependent Claim
29 words
Apparatus as claimed in claim 5, wherein the third means further includes logic means for producing width control signals in response to said phases of the VCO output signals.
Claim 8
Independent Claim
84 words
A method of obtaining a measure of data detection error in devices for detecting data signals, the method including the steps of: producing unambiguously defined timing signals in response to data signals; producing test signals including pulses having constant width in response to the timing and data signals; producing control signals for controlling the width of a test window with respect to the timing signals: and producing a test window by selectively accepting or rejecting test signal pulses in response to the control signals.
Claim 9
Independent Claim
84 words
A method of obtaining a measure of data detection error in devices for detecting data signals, the method including the steps of: producing unambiguously defined timing signals in response to data signals; producing test signals including pulses having constant width in response to the timing and data signals; producing control signals for controlling the width of a test window with respect to the timing signals: and producing a test window by selectively accepting or rejecting test signal pulses in response to the control signals.
Claim 10
Dependent Claim
31 words
A method as claimed in claim 7, wherein the step of producing a test window includes the step of selectively rejecting test signal pulses at each end of the test window.
Claim 11
Independent Claim
34 words
A method as claimed in claimed 8, wherein the step of producing a test window includes the step of rejecting the same number of test signal pulses at each end of the test window.
Claim 12
Independent Claim
36 words
A method as claimed in any of claims 7 to 9, wherein the number of accepted test signal pulses is proportional to the data detection error as a function of the width of the test window.